rabies risk from roadkill

hello everybody, so I registered here because I need help. this might seem crazy, but... there is dead fox (roadkill) on the road some 15 minutes to our house. My son touched tires of neighbours car accidentally with his jacket and backpack and clothes while getting out of our car, then ran away, and washed hands only later, when I caught him. Now I am afraid, there might be some remains of the fox on those tires and he might got infected. I asked neighbour about it. He drove that road, but doesnt remember if he drove over the roadkill or did avoid it. The fox was there for three days, when he drove through that road, and the car was parking some 18 hours since he got home from that trip. So if there are some pieces of that roadkill on the tires, then they are there for some 18 hours, while the roadkill previously was on the road for some two-three days. But it is pretty cold weather now (only around 40F during the day and freezing during night) and I googled the virus can live for a few days in these temperatures.. if there is anybody who can calm me down, I would be really deeply appreciate it! I also googled nobody ever got infected from roadkill or inanimate object this way but am really afraid. I also searched answers here, but couldnt find something that would help me. of course, my family think I am just crazy...

Highly unlikely from such casual contact. Only saliva and nervous tissue contain the virus. The virus dies when exposed to sunlight or dries out. Any virus containing tissue on a tire, if picked up at all, is likely to be at a minimum and dried out after 15 minutes of driving. There is little chance active virus was transferred to a coat or back pack especially after the hours and days you say had passed. I think you can relax mom